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 * and open the template in the editor.
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package br.unesp.demac.bcc.soo.clarus.servlets;

import br.unesp.demac.bcc.soo.clarus.bean.Aluno;
import br.unesp.demac.bcc.soo.clarus.dao.AlunoDAO;
import br.unesp.demac.bcc.soo.clarus.dao.AlunoDAOImp;
import java.io.IOException;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author esaheki
 */
@WebServlet(name="LoginServlet", urlPatterns={"/LoginServlet"})
public class LoginServlet extends HttpServlet {
   
    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");

        HttpSession session = request.getSession(true);
        String user = request.getParameter("txtUser");
        String pass = request.getParameter("txtPass");
        String page = "";
        final String errorMesg = "Usuário e/ou Senha inválidos!";
        final String errorMesgFaltandoUserPass = "Usuário/Senha são obrigatórios!";

        AlunoDAO adao = new AlunoDAOImp();
        Aluno aluno;
        try {
            if (user.equals("") || pass.equals(""))
            {
                page = "erro.jsp";
                session.setAttribute("mensagem", errorMesgFaltandoUserPass);
            }
            else{
                aluno = adao.validaAluno(user, pass);
                
                if (aluno != null) {
                    page = "index.jsp";
                    session.setAttribute("aluno", aluno);
                } else {
                    page = "erro.jsp";
                    session.setAttribute("mensagem", errorMesg);
                }
            }

        } catch (SQLException ex) {
            page = "erro.jsp";
            session.setAttribute("mensagem", ex.getMessage());
        }

        request.getRequestDispatcher(page).forward(request, response);
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
